Boat fender



FIG. 1 is a perspective view of a boat fender showing my new design;

FIG. 2 is a left end view thereof;

FIG. 3 is a right end view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a rear view thereof.

The ornamental design for a "boat fender", as shown and described.